Black seed oil is the blessed oil and can be used as a go-to treatment for almost any ailment, small or serious. Black seed oil has been proven to help treat the following problems: headaches, toothaches, nasal congestion, colds and flus, digestive and gastrointestinal problems, hair and skin problems, allergies, diabetes, insomnia. It is also use to stimulate metabolism and against discouragement and lethargy.